Abstract: Apparatus for joining a tooth to an interlocked adaptor of a construction tool having a keyway passing through the interlocked tooth and adaptor. An L-shaped elongated key is inserted into the keyway so that the two sides of the key form a channel with the keyway which is filled with an elastic filler material. The key also has recessed areas which form recesses with the keyway which are also filled with the elastic filler material. One end of the key contains a plug to prevent the filler material from passing out of the channel.

Abstract: The device is distinctive in that tooth (D) and matching adapter (A) are both designed with matching shapes to allow, after assembly, the formation and definition of one or more spaces (V) of variable shape, as appropriate, the adapter and tooth being made with one or more openings allowing the filling and application of a special-purpose material (M) in the above-mentioned space(s), said special-purpose material fulfilling the functions of locking the tooth relative to the adapter by absolute contact between the tooth and adapter by forming a contact cushion that ensures distribution of the stresses and strains in all the areas filled by the material.